UEC50LSH-Eco
The UEC50LSH‑Eco is a medium‑power, electronically controlled 2‑stroke low‑speed crosshead diesel main engine designed for direct‑drive installation on merchant vessels, notable for its flexible fuel capability and IMO Tier II/III emissions compliance.
Engine Specifications
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Designation decoded
UEC für Mitsubishi/J-ENG, 50 für Bohrung 500 mm, LSH für Long Stroke H-Type (neueste Generation), Eco für Effizienz-Optimierung. Specs: Hub 1950 mm, 5-8 Zylinder, IMO Tier II/III.
Background
The UEC50LSH-Eco is J-ENG's current generation in the 500 mm class with electronic control. J-ENG (formerly Mitsubishi UE Diesel) is the third 2-stroke engine manufacturer alongside MAN and WinGD with approx. 5–8% global market share. LSH-Eco is optimized for low fuel consumption and EEDI Phase 3. Primarily deployed on Japanese new builds via exclusive licensees. Stroke 1,950 mm at 500 mm bore yields S/B 3.9.
Calculated metrics
Inspector checklist
- Zylinderlaufbuchse: 500 mm Bohrung, Hub 1950 mm, S/B 3.9 — moderates Hub-Bohrungs-Verhältnis, Verschleißmessung an 8 Punkten
- Piston rings: Latest UEC generation — document wear and blow-by
- Kreuzkopf-Lager: Bei S/B 3.9 moderate Seitenkräfte — Lagerspiel
- J-ENG LSH-Eco system — independent platform, not MAN ME or WinGD UNIC
- Einspritz-Aktuatoren: Eco-optimiertes Timing
- Software-Version gegen J-ENG Service Information prüfen
- Slow-Steaming-Konfiguration: LSH-Eco ist dafür optimiert
- Einspritzdüsen: Eco-optimierte Geometrie — Sprühbild
- Kraftstoff-Separation: Cat-Fine-Entfernung
- Gland: drainage rates and trend
- Auslassventil: Elektronisch gesteuert
- Turbolader: 1× Mitsubishi MET — keine Redundanz
- Scavenge air cooler: cooling capacity at slow steaming
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature per cylinder | 340–410 °C at 85% MCR | Spread >20 °C → Einspritz-Problem |
| Scavenge Air Pressure | 2.0-3.0 bar abs at MCR | Turbolader prüfen |
| spezifischer Brennstoffverbrauch | Eco-optimized — document baseline at commissioning | Anstieg → Verbrennungsoptimierung prüfen |
| Zylinderöl-Feed-Rate | 0.5-0.8 g/kWh | BN-Matching |
Common Failure Modes
Expert tips
- 💡 UEC50LSH-Eco mit S/B 3.9: Moderateres Hub-Bohrungs-Verhältnis als der C2-Variant (S/B 4.6) — unterschiedliche Kreuzkopf-Belastung beachten
- 💡 J-ENG mit 5-8% Marktanteil: Nischenprodukt, aber technisch ausgereift — Erfahrungsaustausch über J-ENG User Forum nutzen
- 💡 Eco baseline: record performance data at commissioning as reference — quantify eco degradation
Related components
Classification & regulatory
IMO Tier II/III. EEDI Phase 3. LSH-Eco ist J-ENGs aktuellste Plattform für Neubauten.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Service & Maintenance
Standard 2-Stroke intervals per J-ENG manual.
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